Meaning of buttoned-up

but•toned-up

Pronunciation: (but'nd up'), [key]
— adj.
  1. carefully planned, operated, supervised, etc.: one of the most buttoned-up companies in the business.
  2. conservative, as in professional style or manner: Employers are looking for buttoned-up types.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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